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Allochthonous litter inputs, organic matter standing stocks, and organic seston dynamics in upland Panamanian streams: potential effects of larval amphibians on organic matter dynamics

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Abstract

Allochthonous inputs of detritus represent an important energy source for streams in forested regions, but dynamics of these materials are not well studied in neotropical headwater streams. As part of the tropical amphibian declines in streams (TADS) project, we quantified benthic organic matter standing stocks and organic seston dynamics in four Panamanian headwater streams, two with (pre-amphibian decline) and two without (post-decline) healthy amphibian assemblages. We also measured direct litterfall and lateral litter inputs in two of these streams. Continuous litterfall and monthly benthic samples were collected for 1 year, and seston was collected 1–3 times/month for 1 year at or near baseflow. Direct litterfall was similar between the two streams examined, ranging from 934–1,137 g DM m−2 y−1. Lateral inputs were lower, ranging from 140–187 g DM m−1 y−1. Dead leaves (57–60%), wood (24–29%), and green leaves (8–9%) contributed most to inputs, and total inputs were generally higher during the rainy season. Annual habitat-weighted benthic organic matter standing stocks ranged from 101–171 g AFDM m−2 across the four study reaches, with ∼4 × higher values in pools compared to erosional habitats. Total benthic organic matter (BOM) values did not change appreciably with season, but coarse particulate organic matter (CPOM, >1 mm) generally decreased and very fine particulate organic matter (VFPOM, 1.6–250 μm) generally increased during the dry season. Average annual seston concentrations ranged from 0.2–0.6 mg AFDM l−1 (fine seston, <754 μm >250 μm) and 2.0–4.7 mg AFDM l−1 (very fine, <250 μm >1.6 μm), with very fine particles composing 85–92% of total seston. Quality of fine seston particles in the two reaches where tadpoles were present was significantly higher (lower C/N) than the two where tadpoles had been severely reduced (P = 0.0028), suggesting that ongoing amphibian declines in this region are negatively influencing the quality of particles exported from headwaters. Compared to forested streams in other regions, these systems receive relatively high amounts of allochthonous litter inputs but have low in-stream storage.

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Acknowledgments

Funding for this project was provided by National Science Foundation grants DEB #0234386 and DEB #0234149. The Smithsonian Tropical Research Institute and Parque Nacional General de División Omar Torrijos Herrera provided logistical support and related fieldwork in Panamá. R. Brenes, S. Connelly, A. D. Huryn, S. Arce, C. Espinosa, J. L. Bonilla, H. Ross, A. Millan, and F. Quezada assisted with field collections in Panamá.

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  1. Department of Zoology and Center for Ecology, Southern Illinois University, Carbondale, IL, 62901, USA

    Checo Colón-Gaud, Scot Peterson, Matt R. Whiles & Karen R. Lips

  2. Department of Biosciences and Biotechnology, Drexel University, Philadelphia, PA, 19104-2875, USA

    Susan S. Kilham

  3. Institute of Ecology, University of Georgia, Athens, GA, 30602, USA

    Cathy M. Pringle

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  1. Checo Colón-Gaud
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  2. Scot Peterson
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Correspondence to Checo Colón-Gaud.

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Colón-Gaud, C., Peterson, S., Whiles, M.R. et al. Allochthonous litter inputs, organic matter standing stocks, and organic seston dynamics in upland Panamanian streams: potential effects of larval amphibians on organic matter dynamics. Hydrobiologia 603, 301–312 (2008). https://doi.org/10.1007/s10750-008-9294-3

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